1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1439fea5995b2ee18a78fe16378640dcb4e39979913f2b2848a6f6b78c4b86ea. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8e2eafa9-f369-40f6-9791-6f073947652a.json and https://artists.proofprofile.net/proofs/artist/8e2eafa9-f369-40f6-9791-6f073947652a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb878d63146797bda7b2c35a912a524c252eb28868814fe391951a5c78f1941b0. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ22202475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecfeecd53d264dc245ae8a3778aff438df24eff69e8d86ede723aed59d03a2dc. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWT2259043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe74e222b7c5e4729f24a78d2e6b88473f54bad7c89eda52dddb63ea63f12845. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE6SA2099332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecfeecd53d264dc245ae8a3778aff438df24eff69e8d86ede723aed59d03a2dc. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWT2259043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb5e260b72fecb76ff0220046b6e133940ac32eda839865e83d9ebae476f10e7. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE6QE2059098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96c5be6c4bd7bb38bbbe67aacbb3218510aa3e6512a5adc90b345e5ada331845. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-15T23:25:50Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZES72307145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x569e981b0f5d66031fff064fc377c8036e6da48d44f0dc294fbd0d5b579c7ac8. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN42395344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e44fd60d1bfa4de64dd1e31bba5c7214f7e6e1041cea46381878ad81dcd0e1b. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN52337922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbfea77cd02c951574331cde62f0ad0e278593fc367ba2c75e767395b93a98df. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN42396027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x569e981b0f5d66031fff064fc377c8036e6da48d44f0dc294fbd0d5b579c7ac8. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN42395344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x709c0f05e68569e21f25748748e23e6bd787105e7d12ea9e1d7a48f79a41bca7. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHN72367585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x827d4b000aa8d03f357b98657b469f90ca10f9f159ae76cf1054c0d146272d71. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6P2389125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x827d4b000aa8d03f357b98657b469f90ca10f9f159ae76cf1054c0d146272d71. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6P2389125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cb019d85e40a8492553c883ae1d85c4908596e0b9d456d5ff9d697e521adbff. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZPLR2370902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0e4f3ce99f88e0cb2e8fa41cc7bb7f91fccb8856f7d6beea74726f685408bec. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWX2490680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc3df066cf2dd3b289028f8d90d9a80525b2f84bc91d7036c4fc96c2fa5bcb57. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ72507926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44196e88c3285fda4b412a812954cdd8d3ebd7eda7fbd72ec96669c24c2be50a. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZDA42545993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda635104df9b48e3ee7fff8cb26176bdadcc59d77e558c0e6fbfa20e2a13c55d. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZES82591540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78abd1d2f1b97b358064fb931faa3fc1cd553f8780a38124936c1dbec9f20aee. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZES82591542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda635104df9b48e3ee7fff8cb26176bdadcc59d77e558c0e6fbfa20e2a13c55d. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZES82591540.